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Diffstat (limited to 'src/test/ui/consts/qualif-union.rs')
-rw-r--r-- | src/test/ui/consts/qualif-union.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/ui/consts/qualif-union.rs b/src/test/ui/consts/qualif-union.rs new file mode 100644 index 000000000..11c019be9 --- /dev/null +++ b/src/test/ui/consts/qualif-union.rs @@ -0,0 +1,33 @@ +// Checks that unions use type based qualification. Regression test for issue #90268. + +use std::cell::Cell; +use std::mem::ManuallyDrop; + +union U { i: u32, c: ManuallyDrop<Cell<u32>> } + +const C1: ManuallyDrop<Cell<u32>> = { + unsafe { U { c: ManuallyDrop::new(Cell::new(0)) }.c } +}; + +const C2: ManuallyDrop<Cell<u32>> = { + unsafe { U { i : 0 }.c } +}; + +const C3: ManuallyDrop<Cell<u32>> = { + let mut u = U { i: 0 }; + u.i = 1; + unsafe { u.c } +}; + +const C4: U = U { i: 0 }; + +const C5: [U; 1] = [U {i : 0}; 1]; + +fn main() { + // Interior mutability should prevent promotion. + let _: &'static _ = &C1; //~ ERROR temporary value dropped while borrowed + let _: &'static _ = &C2; //~ ERROR temporary value dropped while borrowed + let _: &'static _ = &C3; //~ ERROR temporary value dropped while borrowed + let _: &'static _ = &C4; //~ ERROR temporary value dropped while borrowed + let _: &'static _ = &C5; //~ ERROR temporary value dropped while borrowed +} |